A mile underground scientists are assembling the futuristic-looking core of the SNO experiment: a geodesic sphere covered by an array of 10,000 photomultiplier tubes. The project will help provide key information about the nature of neutrinos. (SNO-XBD7910-04027-09) Photo by Roy Kaltschmidt

Project scientists take a break from work at the Sudbury Neutrino Observatory in Canada. Left to right are Berkeley Lab project leader, Kevin Lesko, and Martin Moorhead and George Doucas from Oxford. (XBD9712-04566)